If you liked Amazon students, here is what it says:
On Facebook:
Didn’t win a Kindle Fire 8.9″ today but still want one? We have an exclusive deal for Amazon Student members through January 30… (It’s free to join Amazon Student)

On Amazon:
Exclusive Discount on Kindle Fire 8.9″
Special pricing available only to Amazon Student Members with an active Prime account (free six-month or $39/year plan). Join Amazon Student or start your discounted Prime membership to take advantage of this sale. The promo codes below will become available 24 hours after activation of your account, through January 30. New members, don’t forget to check your .edu email and verify your account.

So it does NOT mean a free Kindle! They only give $50 off.

So what happens when you install an amazon app via Facebook? is it a free Kindle or something like this?